cos^2(125-x)-cos^2(55+x)
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Answer :
Now, cos² (125 - x) - cos² (55 + x)
= cos² {90 + (35 - x)} - cos² {90 - (35 - x)}
= sin² (35 - x) - sin² (35 - x)
= 0
RULE :
sin (90 - θ) = cosθ
cos (90 + θ) = - sinθ
cos (90 - θ) = sinθ
#MarkAsBrainliest
Now, cos² (125 - x) - cos² (55 + x)
= cos² {90 + (35 - x)} - cos² {90 - (35 - x)}
= sin² (35 - x) - sin² (35 - x)
= 0
RULE :
sin (90 - θ) = cosθ
cos (90 + θ) = - sinθ
cos (90 - θ) = sinθ
#MarkAsBrainliest
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